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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dee7f6ef3bfdefbf079015543b78351708a03087a3c5280dca0738b4eda476d' 
  AND token = '9FdcU7nELatVzJ7C/UO3qzCSUMXfEM2kue8DBaJgFWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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