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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1a005f0645f772b11f040b4f3205208992207e6aa4d9feaed9f4bed8f180a2' 
  AND token = 'SbR4qaT8XtdxHCC6esz7ZzIP0gGQtxq/+386QF1GfoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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