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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013d31bc2e202c109039e0589d80fcbb7d69e31cd967d1069d9893829b0c6821' 
  AND token = 'nR4M6f1wRvalmALzOZWVgNUB1swOiSpyeXB8Kc3YvLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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