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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e95e6421f4040508b9a7cdd396ea76a685a8dd2f055669ae347592dd8fc0b2' 
  AND token = '2FJHT4K9V2EYZfhJFhkTXcdpd63n+GGCWuwDVSCnaug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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