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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6656e5ddc11f9562c441ec6625d521d98def2c1e1ffc3be51cb02823d44e87' 
  AND token = 'wvOdO/ooRNkYPcCUXAJY1YT9eRWKpwcggIFolP4+2Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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