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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b01db3aec50c8953c5ff633e8cb9c4272bc740355d970da06d08f12d00d82a' 
  AND token = 'j78DvWDcbe2OsAaf1RdPJsr6+m2kGYolcL5usW59KrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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