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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56696cff0eccb918ec3174ffd4bb7724655885305d31a2ea836f665bde408af3' 
  AND token = 'bOu7Lkqma2ctkK1iyXl7Swow4NPrQB0Ws7AcG5plsbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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