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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8068625accdb00ccf41dcd2319d269ee22c4e1f672e7ad9a3b4a16dbe9e360' 
  AND token = 'IDNNSv78hdyLj3lbKGq1i7aMOaDNRpwEd0OD/OdmTuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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