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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b412f4b6ec20b641d8a2e78271853fe2ca705c7c954b6c34003046114cb6e9' 
  AND token = 'K7SNHzo/zLIglCbc1SZaAG3cNYozXsKbP0ss3r0vZXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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