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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92042d6970bbba9a462dd7cda7def684229a232ebf41c596313b6efedcfd8526' 
  AND token = 'tb9vzFO2c/1HLENMAVOe4WVTq/Bw3+ebHackE/KXCFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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