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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8a40c3ed020e0780e629a96cf72d3dff5ac28839edc8a995c9d0e7df7fb571' 
  AND token = 'fCLpddz5oNUsKjqK82h5DohCDd+z67BEKwT3e9LMSkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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