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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7405fbac90a0fe86d351a182f0bd924447f71b37ddee9d58171d16ca10d745b' 
  AND token = '48RnXO6EA6rBvf0Zy4TH4lwSlTP/zm2B415ivDUYS78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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