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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d08d436851247396a867923a5d49814a3c7ca7f0e6e80dcc11ad26b2b949cd1' 
  AND token = 'gpFlyNfk5NV882ibjrxq0v6qqNy8evFxrN4RLIvOQpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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