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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470901583e3f6752e5a5357c305e7eb0b078908f338e52c9c67d118f75a47f6d' 
  AND token = 'e29auabWhnPbHauzTWTQ0fBPy8RU7CPYVWicvC1asX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}