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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432956f625204853dd91a28c281ab7bde2b7bb9d15e1624681b9e344e6ec2793' 
  AND token = 'XCt3fLbAqAlDt6j4ABkS8R2x4xFdnSi/Y3K6HIvygtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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