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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985fff6672a6108f817b03f267d8b2234e1b4eb3c66f0a744cfa00fb5be6cb00' 
  AND token = '4hMke6ix7n3sgOY4DsaC6Cfs7n2qddB+S18/T2ZqpjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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