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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d451ca5a8464ef6c0bd1084d126b342cb72e72c64e9e73de1a270371b104ed' 
  AND token = 'W7CprRwL+/3jm4SYn3IElisY4XCBrTWsic7lqos/36o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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