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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa676c32a6192ca230660829aea24f53c1b5030f0165c3589dff3dcbf30eaf8' 
  AND token = 'jWhoWb3hzFkS6rDicK+X+N6xNU3Tpt0lYo92XI6bKyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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