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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22223ed86a7d47c28a9779b8aa18c148b0b7990458bfa94d6eb5b7eb3723d828' 
  AND token = 'VIFaQdRdU8q9vFBC1KpN7znO/SuY5T386M3AoINGMKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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