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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfddf887b3e84ca627707103e2fda5d929982db007fab0a5a281a92082ab4bc7' 
  AND token = 'syCfDZNsXL1xD1xYc03G/LsicZyqSEhjQICFQAtAbqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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