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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4135f9d53774b9d53df01dab1f203bf9c7366426164f8caa4deb14a51136f8e4' 
  AND token = 'WarQSUl3fBzjFGhJhs1CNH5haCam77icocfCOd1TBxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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