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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a0369758fd7974dea541460d680d1536a6e8069dd83882e336ae9883313661' 
  AND token = 'jfAF1sNZBr0vW7CH9/Z+gTE+Vc6py/xxbOMuj9do1aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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