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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ffc37e68c986ca9e9df688137099531026dff8ac671c974d260d85898cb7ca' 
  AND token = 'It1F5GGUcr7uTHz10xCwQHjKjrmjLtRMVaiGT5FZR3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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