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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a7873d5c6203799fef0dd44e7916ed420ae38fad0f4ce4ddc06e6d56e97472' 
  AND token = 'KbMGqPmTpCUPBLXiCuJNjf22iR8DGtnPnJ1/gnfAePY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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