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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803ebf1bf30fa42642ab973b6d56a6783c79eb2dc29bc2292a12f3b38dd092ac' 
  AND token = 'BoFwXPIN1sGFtx0XpcV1f1FRBt7kH92DY3P8F/G8kT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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