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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48142bffacb6bc360b9fc077d8a0f3b999b9dcbf5462e0011a687af3d16de36c' 
  AND token = 't36Y8Ye830gs8AWNKwmTgBkIQB7U8OWzNAfM6F/oXCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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