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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b59d6c386e21a7d5c0973673f1aad76ad27cc9967207fcf207639bac41febe9' 
  AND token = '4fuFGhBG/m+0ofeh+3716//W8eOFc7UHCT23CT6HoSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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