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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbdb960bcb9b945a2e3a14b228b8e8fba16c5694077a253aa585937868ad4f2' 
  AND token = '+sNI09n151xKJuAlgU1huQoRs353epLSCj97O12TBCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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