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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eeb8299031a7c0034622727ecd24ab3ee653d2cd472311b373bf3661024d361' 
  AND token = 'sZBgME6neWeslWNWybyRHUiPD4EXQ7t8LuXoe8CKS0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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