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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5508337554b4a12db94aa0047d2c8f93d37c0e79b15ef2d73e5d68a5ef59306b' 
  AND token = 'YazwKR/Kxcu1YkHW7FD5zgBR5XFOV3XyLJZdHEEIfDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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