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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd542048cbe04fc94153274e05da1b3840403b465b9e04691897c0468caa01ed2' 
  AND token = 'Hr8qNqVnbZCM7mKuWjySngjrUwg9i4EP+4AH7fja5ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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