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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e984a4853c2f1f1a644ea7dc51a08bf7052a6b89d448c5c151299a7f51ed6bca' 
  AND token = 'NAXyVq2XwWIb+BJ9TZNz64spopvOyV5D4zl6q44z/S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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