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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb418fef7a5b4c298d126b48620b266fcbc25509814a7fe852f515cb76f2d24f' 
  AND token = 'xc/JwWR0faAaVeFkSg3G+ta+cv4FbpXWQFZyH8n0ezQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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