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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c7e6e087f5c45952d54f797b0958dd0ab00177f5e5e53f5b9632665695206f' 
  AND token = 'IU02lT+4HFA4mQwRPRRBrzuoaKuejIhlMw/y5A3cHp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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