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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d77a9d5a5d584a1de4d456adf4021a6ce0a5775d800e2bc4fd380112bf00ff' 
  AND token = '1p/h12Q6wwPMuv0VoqsRF60He29w6eslI3DXXqrRtso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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