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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08acbcf609b946f824664ec669393cd9f62759758c53c5aaef012291e9301990' 
  AND token = 'sNnHGwN6u/m5ewwoepqRvy1axYyvX8UUTNFQy9+ZmXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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