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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1555d901e2c5c2421fe31e64b90b78668906942ca93fc420cb0a2666eebd9b' 
  AND token = 'G+fu4QiweC0MShXMVLC7Fywf9HD+jAwrJ/onP7tAFA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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