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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2da2b990b9244cb7fa28e90e62773d04114a7094a269e7c1fadfc1caed2bb16' 
  AND token = 'B7mMCmKkESv8ZbQDtVpWSteIZZZEWW0Gl5gZM0pgE8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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