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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff95c28501967373888c18f71b6946c6c4328be3382703ab6ab597ec7d9b1688' 
  AND token = 'j/zGePmBoorZ6n3StSEhyGyPW3pdx5VQ9MLTl4s2fPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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