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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9cb882a6df560ea56c17f9788c52c0802fae236799b80f2b24fd6c6eea195e' 
  AND token = '21Vzi0k6G1B81hGZuCSVG6EVmBQT9cegyIBLeryRxwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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