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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4765356e950b3212e4bc4ed0252c3108eb034151762acb7db8bb4fedfe3995b0' 
  AND token = 'DyN+PuL3YqNpa4DPSHwvHfryazjmk+oGLsje4Gg0Keo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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