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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3244fbdf4e66a8573330ec7e42a37e4067896a4024c03ca8f8e124645670667d' 
  AND token = 'Qdwt2hol/FOsQiGoChrBfZV62LxlzZz0bRw7AV7FlCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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