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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9a1686f2da620f2ceb3be58fa980ebd70db2f4dd83637d6daeda6d99097a85' 
  AND token = 'gqOeRJxe7yIT9K5Xgmon++1n0HuxZsNVMf47q4FBRc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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