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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7edea04adccc5622f700d8244b6f88734a8e9cc3a8826d771da64e0184bf066' 
  AND token = '7IkLQhvsFJeMD2tjOLcDb0OY9HwPQGjMmmUiygs1gZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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