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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a068a69f7c1b5b16e13c6b5d10bec4c50aa5ac60bd45ca293a37ea263f0b44' 
  AND token = 'IIj2eKqNeM1DEp4gskzrf/JM/k0LueLrcMqSMRbo090=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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