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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f660b161cbb769313b5b9ab2deb7c2490feeb6e77a3729bf3ed546853af4b64e' 
  AND token = 'zv+vwM8C4PgRjFm0SNIZT76gkTX3mXga4iX4o2PaBy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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