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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6226d7a90a7c64dc3b8fda224741a0c554d5b3d4ff7e04fc9ca6d4d229c3ab46' 
  AND token = 'V9bBOXtnn5gK1DLnhHXWs5qdG5PaqtFhTkbw/OT8dY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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