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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba6a91c9a6faa544ac1bb23b088cb185e5fa95d6ff2f494d0f3138558c84a1b' 
  AND token = 'FVkZEAYo6UgtydoZr3PY9Sfw1WdqX+M+xe2/Wd9cHg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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