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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693585d732df87fc7d4d7fad53f6c6031d283b01815cc19f58d8bf02133c09ce' 
  AND token = '1XsT4NZbHoeWQegJ9dOYC9qFeLdvvqRgCJXZX5JXoaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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