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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7311638d3a27d31249e959bbda89e91f411bf8db6a0a3ce8ee30723d38c14d6' 
  AND token = 'T5LQr6oGm6LPW6HA6Tl2FiBHyfylkxaCWF+h0IGdtJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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