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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef899845039decff71ba24ad11cc65d5f17e284e527fe53156fae65b723a39ec' 
  AND token = 'oC/xkD/Nw/LseYvGRecYUJiF4MBNZ3Z0fvvz1KUGCEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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