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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a7e333b0a1c3b2cb6f76d685de69571ddfc03d4fcb777b1460f107257a9547' 
  AND token = 'mZnxeXBf1i9F5fSxlQ5hLedgBQ/kWEZXKU5F9FKfSA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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