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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbace64a8d4c470bc8d115c6c7f4a3567892287f810275ef60d3859f38ffa8c' 
  AND token = 'G5kbXRV0IjGMrnC3zLO4VyyCCg1EBdV+YbYCHGa15JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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