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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2ccc7aed41da9ce36c5c87d45d27a14856359a42ca73b9742fb0fe1540b136' 
  AND token = '5FkTxlsbOHzIHGioapr7E65DmuuK4/PFNCCh0A+Cnv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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