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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bcf10ebc9714dd02a90ae9ec226473b7eca2697ed73fb90418a1273dd75bd6' 
  AND token = 'MPcY7o3lRR3zt7hN0h8hhw1Mj410AwZ2oolew10FYzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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