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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cdf98c486d2f23e8b630695869377e5ed7f294aac2be22d70338cd11a4db94' 
  AND token = '7IwzxeBZK4TCM5PP7XGbPt4ot4KZ1qxNk9Lnve+/0co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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