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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498f639286af0c832667e1fb752b7216cbb506f5e54895d9df847a9914a2080f' 
  AND token = '8MRCk4BjP68C+bNu15iGrxVmXAly7GW79TvfeDt2qPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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