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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a890a51712ebbe88bf9dd99dc804407f8359bd6043795ca5d5029c088e6ab31' 
  AND token = 'b0QIMGe8itNZJd6IPKND0eh54NAB9NOrI5JMnns0cHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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