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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77be27f3966d11fe7c8077a1331563b73caa1452890ce9e32b0994cfdd28d78f' 
  AND token = 'AfcyHFOBzmy/xNqdJoALTPuN1gUTvdllrb8dmJVS5hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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