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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7819ed5b7c63992a299ca8864edcf509805ec09db5283c5dea5d8ca8064c4775' 
  AND token = 'zNx/NToq/zFee/w+5xxhBwpBxJfZSpicTJqh74OPgts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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