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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0c7356d49a7c3938af27c30f15675091ca77e127a56314b12469759eb318cf' 
  AND token = 'VOvslnFh1JR2TnpeCkfYq/j0wHmFHhNCw0Artbty9Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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