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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f499b86810d4ebe8a9193bfbb3bd862a915b309030ba5734cb622ada2c5cb8' 
  AND token = 'qzcGjRHPuXsPE4rDpYWwXIgT3vQmHaqVU10xrJb1TyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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