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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56c92680887bf8c70206ae71ca8d779979f5816f6d75e72b07df94dfbc6ed98' 
  AND token = '6ERmh2nFshPGUnBNa4GyRgdsz64p9nxCcL5LnkKuGao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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